Hi - I have a 200W Aqueon heater in my 55. When it gets colder (the room gets down to 60F sometimes in winter) I knew I'd need another heater for the opposite side of the tank. Well, I got one at Petco the other day. They had both the Aqueon and the Aqueon Pros. Well, the 200W Pros were $40! Eight dollars more than the Aqueon, so I got the Aqueon. What exactly is the difference between the two? Is it just the green and red indicator lights? If so, I can live without the Pro. I also read somewhere that the Aqueon Pros don't have to be unplugged before a water change, whereas the Aqueons do. Are these the only differences? Thanks!